Collision Risk Study Based On Minimum Vector Altitude Establishment

The minimum vector altitude is the minimum altitude at which an aircraft can fly during the execution of an air traffic controller’s radar control,direct flight to a designated position point and other manoeuvres.As an important basis for controllers to issue instructions to aircraft,the minimum vector altitude also serves as an important means for pilots to ensure that aircraft flights meet the requirements of minimum obstacle clearance,and can provide sufficient basis for both controllers and pilots to ensure safety.However,in the process of setting the existing minimum vector altitude,there is a problem that the minimum obstacle clearance for determining the minimum vector altitude in the mountainous sector relies on experience and the sector buffer size is not fine enough.The article therefore investigates the safety of the minimum vector altitude and the refinement of the sector buffer size in order to avoid the possible safety risks in the process of setting the minimum vector altitude.To address the problem that the minimum obstacle clearance in the mountainous sector relies on experience,this paper analyses the working principle of the barometric altimeter and compares several temperature correction algorithms,selects the ICAO correction algorithm for correction,and proposes an altimeter temperature correction algorithm for the mountainous sector combined with barometric pressure difference to solve the corresponding problem.The algorithm is validated by using the terminal area of Urumqi Diwopu International Airport and the terminal area of Xi’an Xianyang International Airport as examples.The results show that the algorithm is useful for determining the minimum obstacle clearance in the mountainous sector and can provide a theoretical basis for determining the minimum vector altitude value in the sector,and that the use of the algorithm can effectively reduce the minimum obstacle clearance in the mountainous sector.It also proposes a law for the influence of temperature and air pressure on the minimum obstacle clearance.The probability of collision between the outer boundary of the buffer zone and the aircraft after refinement is first researched.The article adds ground speed error and navigation error to the original Reich model and proposes an improved Reich model.Simulations are carried out using both B747-800 and B787-800 aircraft types.The simulation results show that the reduced buffer zone of 5.6 km meets the collision safety requirements and that the improved quadratic cone template results are smaller for the same simulation conditions.On this basis the possibility of further buffer reduction is investigated for the future.Various possible errors in operation are analyzed and the buffer zone of the minimum surveillance vector sector is calculated by example by selecting the corresponding technical performance parameters of the existing primary and secondary surveillance radars in China,and it is calculated that the minimum buffer zone of the minimum surveillance vector sector should be no less than 4518 m.This further supports that the refined buffer zone of 5.6 km can meet the safety requirements and suggests a further reduction in the future.This further supports that the refined buffer of 5.6 km can meet the safety requirements and suggests the possibility of further reduction in the future.